Charles longstreth



(No Model.)

. O. LONGfiTRETH. METALLIC ROD PACKING. 1

Patented Aug. 22, 1893.

ATTORNEY i UNITED STATES CHARLES LONGSTRETH, OF PHILADELPHIA,PENNSYLVANIA, ASSIGNOR TO PATENT OFFICE.

THE UNITED STATES METALLIC PACKING COMPANY, OF SAME PLACE.

METALLIC ROD-PACKING.

SPECIFICATION forming part of Letters Patent No. 503,723, dated August22, 1893.

Application filedMarch 11, 1893. Serial No. 465,526. (No model.)

To all whom itmay concern.-

Be it known that I, CHARLES LONGSTRETH, a citizen of the United States,residing in the city and county of Philadelphia, in the State ofPennsylvania, have invented new and useful Improvements in MetallicRod-Packings, of which the following is a specification.

This invention relates to packings of that class used for making steam,water or vaportight joints around piston rods or valve stems,reciprocating or otherwise working in stuffing boxes of engines, pumpsor other machinery.

The invention has for its object to improve packings of this characterin a manner assuring tight joints both around the rod or stem, which. isallowed lateral play, and at the wall of the stuffing-box, irrespectiveof the planes of the end walls of the cylinder and gland between whichthe packing is compressed.

The invention will first be described and then will be particularlydefined in claims hereinafter set forth.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which like numerals indicate similar parts in allthe views.

Figure 1 is a longitudinal sectional elevation illustrating myinvention; an oil cup for lubricating the piston rod being also shown.Fig. 2 is a similar sectional view showing a modification, and Figs. 3to 10, inclusive, are detail face and edge views of the rings,hereinafter specially referred to.

In my improved packing, I employ two outer or end rings 1, 1, ofsuitable metal, shown detached in Figs. 8 and 4 of the drawings, andeach having an outside plane face 2 and an inside concave face 3. Nextthe rings 1, 1, are placed rings 4, 4, each having a convex outer face 5adapted to the face 3 of the adjacent ring 1, and also having aninwardly flaring or inclined inner face 6, and next the rings 4, 4 arelocated two rings 7, 7, having substantially triangular cross sectionalform and disposed with their apices at the inside, and between saidrings 7, 7, is placed a third triangular ring 8 having its apex at theoutside, all as clearly shown in Fig. 1 of the drawings. After thusassembling the packing rings within the stuffing box 9 on the cylinder,valve chest or other part 10, and around the piston rod or valve stem11, working therein, the gland 12 is applied within the box outside thepacking and'is made adjustable to compress the packing, to maintain atight joint around the moving rod or stem, by means of bolts 13 havinglock nuts 14. A spring 15, or other substantiallysi milar elasticbody,cushioning the parts against undue shocks, may be interposed at oneor both ends of the assembled packing rings, as shown in Fig. 2 of thedrawings.

The openings in the cylinder or chest and in the gland through which therod 11 moves are larger than the rod to give it necessary freedom forlateral play to accommodatenon-alignmentof parts of the engine, pump orother machine to or in which the rod is applied. An oil cup 16, shownfastened to the gland 13 in Fig. 1 of the drawings, serves to lubricatethe moving rod 11 and the rings packing the rod within the stuffing-box.

The end rings 1, 1 of the packing, which I term compressing rings, arenot split or divided, but the other rings 4, 7 and 8 are split ordivided and it may be angularly or by a halved joint or in any othersuitable manner allowing them to. be expanded against opposing faces ofthe stuffing box and piston rod or valve stem, to effect perfectly tightjoints thereat by the pressure of the gland.

It will be noticed that by using packing rings 4, 7 and 8 and theplano-concave end compressing rings 1, 1, and even when the end springsor elastic mediums 15, 15 are not interposed, it is immaterial whetherthe opposite end walls of the cylinder 10 and gland 12, which act on therings 1, 1, are strictly parallel and at exact right angles with theside walls of the stuffing-box, because should these face irregularitiesexist, the inner convex faces of the rings 1, 1, will accommodatethemselves to the corresponding convex outer faces of the rings 4, 4,and the latter by pressure on the opposing rings 7, 7 will force themoutward more closely to the side Wall of the stuffing-box, while saidrings 7 force the three rings 4, 4, 8 more closely to the piston rod orstem 11. The efiect of the packing in securing permanently tight jointsat the wall of the stuffing-box and next the piston rod will besubstantially the same when the cushioning springs or elastic mediums 15are used.

' somefeatures of my invention, it is immate-g rial whether the endrings 1, 1, have plane outer faces, which however are preferred inpractice. l

I claim 1. A metallic rod packing, comprising end compressing ringshaving inner concave faces, rings having outer convex faces fitting theinner faces of the end rings and having in-I. clined or inwardlydiverging inner faces, and three or more rings having substantially'tri-u angular-cross section and disposed with apices and bases reversedbetween the last named 1' rings, substantially as described. Z 2. Ametallic rod packing, comprising .nn-E split end ,compressin g ringshaving inner concave faces, split rings having outer convex ingsubstantially triangular cross section and disposed with apiece andbases reversed between the last named rings, substantially as described.

3. A metallic rod packing, comprising end compressing rings having innerconcave faces, rings having outer convex faces fitting the inner facesof the end rings and having inclined or inwardly diverging inner faces,three or more rings having substantiallytriangular cross section anddisposed with apices and bases reversed between the last named rings,

and springs orelastic cushioning devices outside the end rings,substantially as described. Intestimony whereofI affixmy signature inthe presence of two witnesses.

' CHARLES LONGSTRETH. Witnesses:

GEO. I-I. BENJAMIN, EDW, B. HAWKINS.

